* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
+ *
+ * History:
+ *
+ * - 22 March 2011: History section created on top of sds.c
+ * - 22 March 2011: Fixed a problem with "\xab" escapes convertion in
+ * function sdssplitargs().
*/
#define SDS_ABORT_ON_OOM
-#include "sds.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
+#include <assert.h>
+#include "sds.h"
#include "zmalloc.h"
static void sdsOomAbort(void) {
sds sdsnewlen(const void *init, size_t initlen) {
struct sdshdr *sh;
- sh = zmalloc(sizeof(struct sdshdr)+initlen+1);
+ if (init) {
+ sh = zmalloc(sizeof(struct sdshdr)+initlen+1);
+ } else {
+ sh = zcalloc(sizeof(struct sdshdr)+initlen+1);
+ }
#ifdef SDS_ABORT_ON_OOM
if (sh == NULL) sdsOomAbort();
#else
#endif
sh->len = initlen;
sh->free = 0;
- if (initlen) {
- if (init) memcpy(sh->buf, init, initlen);
- else memset(sh->buf,0,initlen);
- }
+ if (initlen && init)
+ memcpy(sh->buf, init, initlen);
sh->buf[initlen] = '\0';
return (char*)sh->buf;
}
return sdsnewlen(init, initlen);
}
-size_t sdslen(const sds s) {
- struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
- return sh->len;
-}
-
sds sdsdup(const sds s) {
return sdsnewlen(s, sdslen(s));
}
zfree(s-sizeof(struct sdshdr));
}
-size_t sdsavail(sds s) {
- struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
- return sh->free;
-}
-
void sdsupdatelen(sds s) {
struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
int reallen = strlen(s);
sh->len = reallen;
}
-static sds sdsMakeRoomFor(sds s, size_t addlen) {
+void sdsclear(sds s) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+ sh->free += sh->len;
+ sh->len = 0;
+ sh->buf[0] = '\0';
+}
+
+/* Enlarge the free space at the end of the sds string so that the caller
+ * is sure that after calling this function can overwrite up to addlen
+ * bytes after the end of the string, plus one more byte for nul term.
+ *
+ * Note: this does not change the *size* of the sds string as returned
+ * by sdslen(), but only the free buffer space we have. */
+sds sdsMakeRoomFor(sds s, size_t addlen) {
struct sdshdr *sh, *newsh;
size_t free = sdsavail(s);
size_t len, newlen;
return newsh->buf;
}
+/* Increment the sds length and decrements the left free space at the
+ * end of the string accordingly to 'incr'. Also set the null term
+ * in the new end of the string.
+ *
+ * This function is used in order to fix the string length after the
+ * user calls sdsMakeRoomFor(), writes something after the end of
+ * the current string, and finally needs to set the new length.
+ *
+ * Note: it is possible to use a negative increment in order to
+ * right-trim the string.
+ *
+ * Using sdsIncrLen() and sdsMakeRoomFor() it is possible to mount the
+ * following schema to cat bytes coming from the kerenl to the end of an
+ * sds string new things without copying into an intermediate buffer:
+ *
+ * oldlen = sdslen(s);
+ * s = sdsMakeRoomFor(s, BUFFER_SIZE);
+ * nread = read(fd, s+oldlen, BUFFER_SIZE);
+ * ... check for nread <= 0 and handle it ...
+ * sdsIncrLen(s, nhread);
+ */
+void sdsIncrLen(sds s, int incr) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+
+ assert(sh->free >= incr);
+ sh->len += incr;
+ sh->free -= incr;
+ assert(sh->free >= 0);
+ s[sh->len] = '\0';
+}
+
+/* Grow the sds to have the specified length. Bytes that were not part of
+ * the original length of the sds will be set to zero. */
+sds sdsgrowzero(sds s, size_t len) {
+ struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
+ size_t totlen, curlen = sh->len;
+
+ if (len <= curlen) return s;
+ s = sdsMakeRoomFor(s,len-curlen);
+ if (s == NULL) return NULL;
+
+ /* Make sure added region doesn't contain garbage */
+ sh = (void*)(s-(sizeof(struct sdshdr)));
+ memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */
+ totlen = sh->len+sh->free;
+ sh->len = len;
+ sh->free = totlen-sh->len;
+ return s;
+}
+
sds sdscatlen(sds s, void *t, size_t len) {
struct sdshdr *sh;
size_t curlen = sdslen(s);
return sdscatlen(s, t, strlen(t));
}
+sds sdscatsds(sds s, sds t) {
+ return sdscatlen(s, t, sdslen(t));
+}
+
sds sdscpylen(sds s, char *t, size_t len) {
struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
size_t totlen = sh->free+sh->len;
*/
sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
int elements = 0, slots = 5, start = 0, j;
+ sds *tokens;
+
+ if (seplen < 1 || len < 0) return NULL;
- sds *tokens = zmalloc(sizeof(sds)*slots);
+ tokens = zmalloc(sizeof(sds)*slots);
#ifdef SDS_ABORT_ON_OOM
if (tokens == NULL) sdsOomAbort();
+#else
+ if (tokens == NULL) return NULL;
#endif
- if (seplen < 1 || len < 0 || tokens == NULL) return NULL;
+
if (len == 0) {
*count = 0;
return tokens;
int i;
for (i = 0; i < elements; i++) sdsfree(tokens[i]);
zfree(tokens);
+ *count = 0;
return NULL;
}
#endif
case '"':
s = sdscatprintf(s,"\\%c",*p);
break;
- case '\n': s = sdscatlen(s,"\\n",1); break;
- case '\r': s = sdscatlen(s,"\\r",1); break;
- case '\t': s = sdscatlen(s,"\\t",1); break;
- case '\a': s = sdscatlen(s,"\\a",1); break;
- case '\b': s = sdscatlen(s,"\\b",1); break;
+ case '\n': s = sdscatlen(s,"\\n",2); break;
+ case '\r': s = sdscatlen(s,"\\r",2); break;
+ case '\t': s = sdscatlen(s,"\\t",2); break;
+ case '\a': s = sdscatlen(s,"\\a",2); break;
+ case '\b': s = sdscatlen(s,"\\b",2); break;
default:
if (isprint(*p))
s = sdscatprintf(s,"%c",*p);
return sdscatlen(s,"\"",1);
}
+/* Helper function for sdssplitargs() that returns non zero if 'c'
+ * is a valid hex digit. */
+int is_hex_digit(char c) {
+ return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
+ (c >= 'A' && c <= 'F');
+}
+
+/* Helper function for sdssplitargs() that converts an hex digit into an
+ * integer from 0 to 15 */
+int hex_digit_to_int(char c) {
+ switch(c) {
+ case '0': return 0;
+ case '1': return 1;
+ case '2': return 2;
+ case '3': return 3;
+ case '4': return 4;
+ case '5': return 5;
+ case '6': return 6;
+ case '7': return 7;
+ case '8': return 8;
+ case '9': return 9;
+ case 'a': case 'A': return 10;
+ case 'b': case 'B': return 11;
+ case 'c': case 'C': return 12;
+ case 'd': case 'D': return 13;
+ case 'e': case 'E': return 14;
+ case 'f': case 'F': return 15;
+ default: return 0;
+ }
+}
+
/* Split a line into arguments, where every argument can be in the
* following programming-language REPL-alike form:
*
while(*p && isspace(*p)) p++;
if (*p) {
/* get a token */
- int inq=0; /* set to 1 if we are in "quotes" */
+ int inq=0; /* set to 1 if we are in "quotes" */
+ int insq=0; /* set to 1 if we are in 'single quotes' */
int done=0;
if (current == NULL) current = sdsempty();
while(!done) {
if (inq) {
- if (*p == '\\' && *(p+1)) {
+ if (*p == '\\' && *(p+1) == 'x' &&
+ is_hex_digit(*(p+2)) &&
+ is_hex_digit(*(p+3)))
+ {
+ unsigned char byte;
+
+ byte = (hex_digit_to_int(*(p+2))*16)+
+ hex_digit_to_int(*(p+3));
+ current = sdscatlen(current,(char*)&byte,1);
+ p += 3;
+ } else if (*p == '\\' && *(p+1)) {
char c;
p++;
}
current = sdscatlen(current,&c,1);
} else if (*p == '"') {
- /* closing quote must be followed by a space */
+ /* closing quote must be followed by a space or
+ * nothing at all. */
+ if (*(p+1) && !isspace(*(p+1))) goto err;
+ done=1;
+ } else if (!*p) {
+ /* unterminated quotes */
+ goto err;
+ } else {
+ current = sdscatlen(current,p,1);
+ }
+ } else if (insq) {
+ if (*p == '\\' && *(p+1) == '\'') {
+ p++;
+ current = sdscatlen(current,"'",1);
+ } else if (*p == '\'') {
+ /* closing quote must be followed by a space or
+ * nothing at all. */
if (*(p+1) && !isspace(*(p+1))) goto err;
done=1;
} else if (!*p) {
case '"':
inq=1;
break;
+ case '\'':
+ insq=1;
+ break;
default:
current = sdscatlen(current,p,1);
break;
return NULL;
}
+void sdssplitargs_free(sds *argv, int argc) {
+ int j;
+
+ for (j = 0 ;j < argc; j++) sdsfree(argv[j]);
+ zfree(argv);
+}
+
+/* Modify the string substituting all the occurrences of the set of
+ * characters specifed in the 'from' string to the corresponding character
+ * in the 'to' array.
+ *
+ * For instance: sdsmapchars(mystring, "ho", "01", 2)
+ * will have the effect of turning the string "hello" into "0ell1".
+ *
+ * The function returns the sds string pointer, that is always the same
+ * as the input pointer since no resize is needed. */
+sds sdsmapchars(sds s, char *from, char *to, size_t setlen) {
+ size_t j, i, l = sdslen(s);
+
+ for (j = 0; j < l; j++) {
+ for (i = 0; i < setlen; i++) {
+ if (s[j] == from[i]) {
+ s[j] = to[i];
+ break;
+ }
+ }
+ }
+ return s;
+}
+
#ifdef SDS_TEST_MAIN
#include <stdio.h>
#include "testhelp.h"
int main(void) {
{
+ struct sdshdr *sh;
sds x = sdsnew("foo"), y;
test_cond("Create a string and obtain the length",
x = sdsnew("aar");
y = sdsnew("bar");
test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0)
+
+ {
+ int oldfree;
+
+ sdsfree(x);
+ x = sdsnew("0");
+ sh = (void*) (x-(sizeof(struct sdshdr)));
+ test_cond("sdsnew() free/len buffers", sh->len == 1 && sh->free == 0);
+ x = sdsMakeRoomFor(x,1);
+ sh = (void*) (x-(sizeof(struct sdshdr)));
+ test_cond("sdsMakeRoomFor()", sh->len == 1 && sh->free > 0);
+ oldfree = sh->free;
+ x[1] = '1';
+ sdsIncrLen(x,1);
+ test_cond("sdsIncrLen() -- content", x[0] == '0' && x[1] == '1');
+ test_cond("sdsIncrLen() -- len", sh->len == 2);
+ test_cond("sdsIncrLen() -- free", sh->free == oldfree-1);
+ }
}
test_report()
+ return 0;
}
#endif
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